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稻粒黑粉病已成为杂交制种及不育系繁殖的一个重要病害。它对产量影响的直接原因是减少了单穗实粒重,增加了病粒率。分析结果表明,正常情况下的损失率应低于病粒率,每穗病粒数的多少对千粒重和结实率的影响不大。模拟为害发病率(X)与损失率(Y)的关系,可建立江农ⅡA/HR1004和汕A/桂33的损失预测方程分别为Y_1=-0.1036+1.0211X,Y_2=-0.0335+1.0528X。结合目前防治费用、产品价格和防治效果,本文估算了不同产量水平的允许损失率,并提出目前的防治指标为3％～5％。
Rice powdery mildew has become an important disease of hybrid seed production and sterile line reproduction. The direct cause of its impact on yield is to reduce the grain weight per panicle, increase the rate of disease particles. The analysis results show that the loss rate under normal circumstances should be lower than the disease rate, and the number of disease grains per panicle has little effect on the 1000-grain weight and seed setting rate. The damage prediction equation of Jiangnong Ⅱ A / HR1004 and Shany A / Gui 33 can be established as follows: Y_1 = -0.1036 + 1.0211X, Y_2 = -0.0335 + 1.0528X . Combined with the current prevention and control costs, product prices and prevention and control effects, this paper estimates the allowable loss rates at different production levels and proposes that the current prevention and control targets range from 3% to 5%.